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This paper develops a quality inspection instrument for a vehicular single-pole double throw switch (SPDT),which includes the hardware design,the detecting principle,and the algorithm software. Firstly,according to the operating principle and quality detecting requirements of the SPDT,a mechanical device is developed to detect the finger pressure,and a relay control circuit is presented to control the channel switch. Then,a detection algorithm is established,in which the information of voltage error,switch state and finger pressure can be automatically acquired,analyzed,tested and judged,thus qualified switches be selected. Finally,a touch-screen interface is designed to show the detected information in real time. The performance of this detection equipment is verified in an automated switch production line almost one year. The results prove that the system runs smoothly,has good detection and low false detection rate. The equipment clearly shows a great capability in improving the testing efficiency of switch on quality and reducing the workload of inspectors,capable of completely replacing manual detection mode.